Deuteronomy 10:20 "And swear by His name"

In court, when the defendant is called to the stand, he or she is questioned again and again by the lawyers and the judge.

The defendant tries to convince the jury that he is not guilty of the crime he is charged with. The judge demands that he swear he is telling the truth.

The defendant chooses to swear by something he holds to be sacred and important. He hopes this will impress the jury of his sincerity and innocence.

In a Beit Din, a Jew may also be required to take an oath confirming that he is telling the truth.

When taking an oath, he is commanded to swear by the name of HaShem. He will be using HaShem's holy name to convince the court of his honesty.